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Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
Consider the following six relation schemes and their corresponding sets of functional dependencies. In each case identify a. All the candidate keys b. The highest normal for
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explain equi-join using illustration
explain multi key file organisation
draw ER diagram of student entity and course entity where attribute of student entity are student roll, student name, student phone and student address and attribute of course enti
What are called index-sequential files? The files that are ordered sequentially with a primary index on the search key are known as index-sequential files
Explain heap file with advantages? Heap File is an unordered set or a group of records, stored on a set of pages. This class gives basic support for inserting, updating, select
Discuss the problem of Spurious tuples and how we may prevent it. Ans: A spurious tuple is, mainly, a record in a database that gets created while two tables are joined bad
Define access time. Access time is the time from when a read or write request is issued to when data transfer starts.
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